My 328 came with the 3 stage manifold. I just got the AA stage 2 tune and it's awesome. The car is more responsive. It's totally a different vehicle, especially in DS mode. However, my mileage per gallon went from 20 to 18 but I don't really care lol.

What year is your 328, you have an N51 engine correct? From looking at real oem, it shows all 328 with N51 engine have the 3 stage intake manifold, so if I got any year of the 328 intake manifold, it should work on my 325?

What year is your 328, you have an N51 engine correct? From looking at real oem, it shows all 328 with N51 engine have the 3 stage intake manifold, so if I got any year of the 328 intake manifold, it should work on my 325?

I cant wait to gain low end torque and more power, car feels heavy.

The production date on my car is 09/09. You can also get the 3 stage manifold from a 330i (production date after 10/05).

In e90pilot's dyno report,
"At about 3200 rpm and 4400rpm you can see the torque drop and rise quickly. These are the points at which the DISA valves open up. As each valve opens, the torque rises sharply."

I just installed 3-stage intake manifold with ECU tuning on my 2.5L 323i.
All process and result is good, and acceleration is smooth with more low/mid torque.
But I use INPA to detect my engine infomation, the DISA valves open at around 2750 rpm and 3750 rpm which is different from e90pilot's results.
I didn't do the before after dyno.
Just want to know whether early DISA valves open is healthy ? will it affect highend engine power ?

Hey,
Is there anyone can help me answer this question?
Is DISA valves open earlier positive to engine performance?

You'll need a gasket set for sure. They're pretty much one time use. If the actuators are attached, you won't need the screws either. You said you have the oil separator so you probably don't need the vent hose. Now you don't need the oil separator either, the 325 should already have it. You just need the hose that attaches to the intake.

In e90pilot's dyno report,
"At about 3200 rpm and 4400rpm you can see the torque drop and rise quickly. These are the points at which the DISA valves open up. As each valve opens, the torque rises sharply."

I just installed 3-stage intake manifold with ECU tuning on my 2.5L 323i.
All process and result is good, and acceleration is smooth with more low/mid torque.
But I use INPA to detect my engine infomation, the DISA valves open at around 2750 rpm and 3750 rpm which is different from e90pilot's results.
I didn't do the before after dyno.
Just want to know whether early DISA valves open is healthy ? will it affect highend engine power ?

Update 3: As some of you already know, I have Active Autowerke's software installed on my 325i. Drivability issues have been completely eliminated and it no longer knocks. When I first drove it, it felt faster. I just got back from Dynospot Racing in San Jose again and the numbers confirm my initial impressions. I don't have the file yet but I do have a print out. The car makes 210 hp @6200 rpm and 202 ft-lbs tq @2750 rpm. 175 ft-lbs tq are available at 1500rpm and doesn't really drop off until 6000 rpm. Since I have the 3-stage manifold there are torque peaks at 2750 and 4000 rpm. And remember, I have 150,000 miles on my car! Considering that I think I finally have a working 3-stage manifold swap with all the kinks worked out. It would be nice to get a stock 330 on the same dyno I used to see how far off I really am.

Update 2: I'm getting another tune for my car except this time it will be custom tuned on a dyno. Many thanks to Craven 328 for bringing this tune to e90post. Saturday May 15 is the big day so stay tuned!

Update 3: This dyno has been floating around for a while but I thought I'd post it here to. This is the before and after dyno charts after I the Gintani tune.

Many people have speculated over weather it was possible to convert a 325i to a 330i. I can safely say I have done it rather successfully. First I'd like to thank Dyno Spot Racing in San Jose, CA for fitting me in their schedule the same day I called them.

Here are the main differences in the 330i and 325i:

Intake Manifold
Exhaust Resonator
Exhaust Muffler
Engine Software

The 325i has provisions in the software for moving the valves in the 330i manifold but does not take advantage of its effects. Here are the parts you need:

It's about $900 for all this stuff and about 2.5hrs of labor to install it. It is DIYable as well.

And now for the main event! Here are the dyno runs. The first pic shows atmospheric conditions and the second pic shows max values. You can see the three stage intake manifold in action by looking at the torque curve. At about 3200 rpm and 4400rpm you can see the torque drop and rise quickly. These are the points at which the DISA valves open up. As each valve opens, the torque rises sharply.

So 210 HP and 187 ft-lbs of torque to the wheels on the best HP run. With an 18% drivetrain loss, that puts me at 256HP and 228 ft-lbs of torque at the flywheel which is right on the money for a 330i. Keep in mind two things: the 325i has a more restricted exhaust and I have 127,000 mi on my car. I think there is more HP in the engine. A cold air intake and exhaust will definatly help the HP numbers at the cost of torque. Those of you with the PBX might have to ditch the box. The engine software may not be compatible with it but I don't know for sure.

Update 3: As some of you already know, I have Active Autowerke's software installed on my 325i. Drivability issues have been completely eliminated and it no longer knocks. When I first drove it, it felt faster. I just got back from Dynospot Racing in San Jose again and the numbers confirm my initial impressions. I don't have the file yet but I do have a print out. The car makes 210 hp @6200 rpm and 202 ft-lbs tq @2750 rpm. 175 ft-lbs tq are available at 1500rpm and doesn't really drop off until 6000 rpm. Since I have the 3-stage manifold there are torque peaks at 2750 and 4000 rpm. And remember, I have 150,000 miles on my car! Considering that I think I finally have a working 3-stage manifold swap with all the kinks worked out. It would be nice to get a stock 330 on the same dyno I used to see how far off I really am.

210 hp from an 330i ? That seems a bit low. On an stock e46 330i ATM Dyno was able to squeeze 225 hp at the wheel and 260 hp at the engine. We would do much more than 210 hp on an e90!! We are doing the 325i to 330i conversion this week and will post the results along with our e46 330i results, but expectations are obviously beyond the 225hp we got from the e46. I have looked up this dyno run from turner motorsport as well and their 216 hp also seems low in comparison. I guess we just do things differently in the Middle East. If any e46 owners is interested in our ECU flash please let me know as we provide a 500$ option of sending you over the ECU file. Will post our version of the conversion and the dyno run we achieve but already I can guarantee an edge over turner motorsport.

Interesting. The 330 there has Super Sprint and was on a Dynapack dyno which bolts to the wheels. The Dynojet I used measured power at the tires so naturally the Dynapack will show higher number. However the Dynapack numbers are far more consistent between cars and runs. Wheels are just another variable that the Dynapack eliminates.

You can't really compare different dynos since they produce such different results. Another Dynojet I used said I had 220hp and that day was hotter with higher humidity. Not sure how your dyno is set up, but Dinan has the same dyno with an air duct that supplies climate and humidity controlled air to the car through a huge fan. That way they can keep most of their variables constant. Even the dyno's I posted are not all the same dyno or environmental variables.

Interesting. The 330 there has Super Sprint and was on a Dynapack dyno which bolts to the wheels. The Dynojet I used measured power at the tires so naturally the Dynapack will show higher number. However the Dynapack numbers are far more consistent between cars and runs. Wheels are just another variable that the Dynapack eliminates.

You can't really compare different dynos since they produce such different results. Another Dynojet I used said I had 220hp and that day was hotter with higher humidity. Not sure how your dyno is set up, but Dinan has the same dyno with an air duct that supplies climate and humidity controlled air to the car through a huge fan. That way they can keep most of their variables constant. Even the dyno's I posted are not all the same dyno or environmental variables.

True but the dyno we have at ATM features a 30-inch roller which is the best out there as it allows for no wheelspin. An HPF e46 m3 with 990 had zero wheel-spin at our dyno, and a 1000 hp EVO 8 was also on full traction. So our results are pretty accurate!

True but the dyno we have at ATM features a 30-inch roller which is the best out there as it allows for no wheelspin. An HPF e46 m3 with 990 had zero wheel-spin at our dyno, and a 1000 hp EVO 8 was also on full traction. So our results are pretty accurate!

Put that e46 in a container and ship it here. I'll dyno it, and guarantee it wont match your numbers. That is what he was saying, not wheel spin... Which has zero to do with this convo.

you can't compare different dynos. My 325i with pbx put down 195ish hp on a dynapack, and later with the 3-stage IM and AA software, it put down 236 on the dynapack dyno.

stock, on a dynojet, my car was around 179whp. My friends E46 330i ZHP with performance exhaust made 185 to the wheels on a dynojet dyno.

it's more important to compare your before and after runs on the SAME dyno, as even dynos of the same brand can show variations. So while your dyno may be accurate from run to run, you still can not compare it to any other dyno unless you test them with the same car in the same conditions to see what the differential is.

Put that e46 in a container and ship it here. I'll dyno it, and guarantee it wont match your numbers. That is what he was saying, not wheel spin... Which has zero to do with this convo.

My point was that a good dyno insures that you have an accurate hp reading, rather than a margin to compare your runs to. I agree that it is always better to compare your runs on the same dyno, but a good ECU map is a good map, period. Also, the reason why I mentioned wheelspin is simply because when wheelspin is present, the margin of reading error varies from run to run. So you can't accurately monitor the changes your car is making.